Method of welding



H. BOCK METHOD OF WELDING Filed June 26,

/NveNTa/Q Patented Dec. 1,1931

insane A UNITED STATES PATENT loreles.

miraron Boex, or nunmr., GERMANY mann or wnnnme Application led June 26, 1929, Serial No. 378,988, and in Germany Aprila, 19%.

especially if aluminium receptacles are to be y able to stand a high internal pressure. Also screw-threads in connection with tightening rings, etc., is impracticable, especially in such cases in which the frontal wallsare to receive and to support heating or cooling tubes, in that in such cases the tightening or packing members if worn out cannot be replaced by new ones without destroying the respec,

tive tubes.

Now, according to the present invention an unobjectionable connection or union by Welding is attained in the manner described hereinafter in connection with the accompanyingdrawingsin which is shown diagrammatically and by way of example in Figure l an axial section through a cylindrical drum, the shell of which is united with the frontal walls according to this invention, and Figurev 2 is a s'e arate view of the righthand upper corner o Fig. 1, drawn to a greatly increased scale relatively to Fig. l.

On the drawings a denotes the frontal walls and c the shell. As seen, the walls a are considerably thicker than the shell c; they serve for supporting a large number ofI heating or cooling tubes b, (of which only a. 40 few are shown) and near the shell is in each frontal wall a circular groove f in the inner face thereof. The grooves arefproduced, of

course, by means of a suitable machine tool,

such as a suitable lathe, and besides, a nar- 45 row, but deep groove d is turned into the cir cumferential rim face or edge face of each wall a. The annular inner portion of each wall a isbent at right angles inwardly, in the direction to the other wall that is to say, the portion a2 shown in dotted lines in the righthand upper part of Fig. 2 is bent downwardly so as to form a sort of-ange it. This is eected by a forging operation.

In the meantime the shell c has been manna factured and suitably prepared so'as to be fit for the buttweldin now to be made.; a denotes the welding paces which are, of course, annular or circular and extend round the entire circumference of the shell.. The man ner of execution denoted by i is, of course, only an example.

Where the material used for forming the anges h is lacking in the plane of the well a, there rings m may be attached tothe remain= ing rim portion arfL and connected with it, for instance, by screws.

In the example shown in Fig. l there is, besides the outer shell proper c, also a tubular inner shell a which is connected or united with the frontal walls a in practically the same manner as the shell o. lb denotes the inwardly bent langes formed of ortions of the walls a, and n are the weldin places which are accurately such ones as t cse deu noted by z'. Leaving annular portions like a@ is omitted at the tubular shell s, and grooves like d are, therefore, unnecessary, as the superiiuous material is completely removed in any suitable manner.

- Although I prefer to employ my improved 'method especially in connection with alurninium, I wish it to be understood that l by no means limit myself thereto. The method is applicable also in connection with recapt tacles, drums, and so on, of copper or any other metal.

I claim:

l. The method of uniting by welding the l shell and the frontal walls of metallic receptacles, drums, and the like, which consists in forming grooves in the annular portions of the rim of each frontal wall to provide an nular portions adapted to be bent into in- -wardly directed annular "Bauges, the diameter of which corresponds to the diameter ofthe shell, and uniting this latter with said :dang-es by buttwelding, substantially as set fort 2. The method of uniting by welding shell and the frontal Walls of metallic rene`I ntacles, drums, and the like, the 'frontal la of which are thicker than the shell, which consists in forming'grooves in. the annular portions of the rim of each frontal wall 'to ',rovide annular portions adapted to be bent 5 into inwardly directed annular portions, the thiohiess of which corresponds to the thickness of the shell, and the diameter of which corresponds to the diameter of the shell, and uniting this latter with said flanges by butt- 10 welding", substantially as set forth. l 3. The method of uniting by Welding the shell and the frontal walls of metallic recepv tacies, drums, and. the like, intended to be traversed by tubes, which consists in forming 15 grooves in the annular portions of the rim of each of the frontal tube walls to provide annular portions adapted to oe bent into inwardly directed annular flanges, the diameter of which corresponds to the iameter of the 2p shell, and uniting this latter with said flanges by butt-welding, substantially as set forth.

A 4. A method of Welding' the frontal Walls toa shello. relatively thinner metal to provide a. metallic receptacle, which consists in 2,5 forming recesses in the inner surface of the frontal walls near the perimeter,- then forming a groove in the rims of the frontal Walls to provide a portion bendalole at right angles with respect to the walls to provide Hanges 3.0 then bend said portion, than welding:a sail flanges to theshell, then boring holes in the frontal walls and then inserting the ends of tubes in the frontal Walls.

In testimony whereof I aix my signature.

35 mNRICH BOOK. 

